. >>> plenty to tweet about, including pope benedict's stunning decision to step down. two longtime vatican watchers join us with inside details, at least as inside as you can get when covering the pope. >>> and later, as terrifying a view as you ever want to see. take a look at this video. we'll take you where a string of tornado hit, show you the damage they did. incredible pictures there. we'll be right back. i found a powerful new way to cut out arthritis pain. [ male announcer ] icy hot arthritis lotion. powerful encapsulated menthol gets icy to dull pain, hot to relax it away. power past pain. >>> a lot's happened since the year 1415, but one thing has not, not once. in those 598 years, six centuries, 59 leaders of the roman catholic church have reigned and not one has resigned. since the year 1450, not one single pope has left the vatican without also leaving this world. that is until today. according to the "new york times," this morning at the vatican, speaking in latin to a small gathering of cardinals, pope benedict xvi simply said he's too old and frail to c